Custom horizontal space can be a fixed space or it can stretch. If you specify a fixed amount of space, the program will insert exactly that amount of space. If you specify stretchy space, the program will determine the amount of space that is inserted when your document is printed, based on the stretch factor you supply and the location of the space on the line. A stretch factor of 1 fills the current line. If you specify a stretch factor of 1, you can fill the space with a line or with dots.
To enter custom horizontal space